January Weather in Hanyu, Japan

Last updated: August 23, 2025

In Hanyu, Japan, the average temperature in January hovers around 4°C (39°F). Expect a chilly atmosphere, with minimums plummeting to -9°C (16°F) and maximums reaching up to 17°C (63°F). This month also brings about 40 mm (1.6 in) of precipitation spread over 5 days, contributing to an average humidity of 88%. Bundle up and enjoy the brisk weather!

January Temperature in Hanyu

In January in Hanyu, the average temperature is 4°C (39°F). The maximum can reach 17°C (63°F) and the minimum can be as low as -9°C (16°F). Be prepared for a wide range of temperatures and pack accordingly for your travels.

January Weather in Hanyu: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Hanyu, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Hanyu, January typically has an average temperature of 4°C (39°F), with highs reaching up to 17°C (63°F) and lows dropping to around -9°C (16°F).

Data source: Temperature data for Hanyu generated using information from the Copernicus Climate Change Service.

January Precipitation in Hanyu

In Hanyu in January, the precipitation amount is 40 mm (1.6 in) over the course of 5 days.

January Precipitation Trends in Hanyu

The chart displays monthly precipitation patterns in Hanyu, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In Hanyu, January typically receives around 40 mm (1.6 inches) of precipitation spread over approximately 5 days.

Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

January Humidity in Hanyu

In Hanyu in January, humidity is 88%. With an average temperature of 4°C (39°F), this humidity feels like a damp chill that seeps into your bones, making travel uncomfortable and necessitating extra layers to stay warm.

January Average Humidity in Hanyu

This chart illustrates the average monthly humidity levels in Hanyu, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in Hanyu is approximately 88%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Hanyu

In Hanyu in January, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Hanyu, you can check the information here.

Maximum UV Index Levels in Hanyu for January

The chart shows the monthly maximum UV Index (UVI) for Hanyu in January, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In January, the maximum UV index in Hanyu typically reaches 3, which falls under the moderate exposure category.

Data source: Hanyu January UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How January Weather in Hanyu Compares to Other Months

Weather in Hanyu varies notably across the year, with each month offering distinct climate conditions. This page compares January’s weather to other months in Hanyu, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Hanyu, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	4°C (39°F)	40 mm (1.6 inches)	88%	moderate
February Weather	5°C (41°F)	42 mm (1.7 inches)	86%	moderate
March Weather	9°C (49°F)	129 mm (5.1 inches)	81%	high
April Weather	14°C (57°F)	127 mm (5.0 inches)	78%	very high
May Weather	19°C (66°F)	137 mm (5.4 inches)	81%	very high
June Weather	22°C (72°F)	175 mm (6.9 inches)	88%	extreme
July Weather	25°C (78°F)	274 mm (10.8 inches)	92%	extreme
August Weather	27°C (82°F)	163 mm (6.4 inches)	92%	very high
September Weather	23°C (74°F)	213 mm (8.4 inches)	89%	very high
October Weather	18°C (64°F)	267 mm (10.5 inches)	87%	high
November Weather	12°C (53°F)	57 mm (2.3 inches)	85%	moderate
December Weather	6°C (43°F)	45 mm (1.8 inches)	86%	moderate